Sharpening machine



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May 16, 1933. w MCKERSON 1,909,883

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SHARPENING MACHINE Filed Jan. 17, 1928 7 Sheets-Sheet 7 nan-HI 'wmm Patented May 16, 1933 uu T-Eo STATES PATENT OFFICE wrrimir EMEBY momson, or nos'rou, massacnusnrrs, ASSIGNOR r GILLETTE WARE SAFETY RAZOR COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF DELA- SHARPENING KACHI'N E automatically stropping both sides of a curved edge blade in a uniform manner throughout the length of the blade. In this connection important features of the invention reside in mechanism for holding and presenting curved edge blades to an abrading member and for producing the relative movement of the two required for properly treating the blade. It is important that each individual blade should be presented in identical manner and that both sides of each blade should be presented at the same angle and with thesame degree of pressure relatively to the abrading member. Further features of my invention relate to the construction of mechanism which may be relied upon to carry out these functions accurate-1y, automatically and at a high rate of speed.

My invention also includes a blade holder of novel construction wherein the blade may be firmly and accurately located and clamped by a single movement of a controlling device. As herein shown the holder comprises a pair of jaws, a lockingpiece and an operating lever arranged in one movement to swing the jaw into clamping position and move the locking member into operative position. These and other features of the invention will be best understood and appreciated from the following description of a preferred embodiment thereof selected for purposes of illustration and shown in the accompanying drawings, in which Fig. 1 is a view in side elevation of the entire machine.

Fig. 2 is a plan view of the machine;

Fig. 3 is a rear elevation of the machine certain parts being omitted;

Fig. 4 is a front elevation of the machine certain parts being omitted;

Fig. 5 is a detailed plan view of the blade chine comprises a base A on which all of the various instrumentalities are mounted. These instrumentalities may be divided, for the purpose of description, into three general groups; first, the abrading disc and various mechanisms for giving it the desired motions, second, the mechanism for moving tile 1llade clamp; and third, the blade clamp 1 se The abrading disc is shown as mounted for rotation on a vertical axis and for movement in a vertical direction. In addition to these movements there is also a provision for imparting to the abrading disc a relatively slow, substantially circular oscillatory motion in its plane of rotation for the purpose of distributing the wear over the abrading surface evenly. The means for rotating the disc includes suitable reversing mechanism so that the disc may be automatically reversed. The vertical oscillatory motion is made adjustable both as to range, and amplitude, so that blades of various configurations and sizes may be operated upon to best advantage and the means for oscillating the disc in its plane of rotation is made adjustable as to amplitude to take care of abrading surfaces of different characters which might be employed, it being understood that the present iii? A as by means of bolts B is provided with a pair of vertically aligned bearings B2, B3

in which is journalled a vertical spindle or shaft B4 capable of rotary motion and also longitudinal or axial movement, the lower end of the shaft B4 being mounted in a moveable step-bearing B5. A pulley B6 is suitably mounted upon the spindle between bearings B2 and B3, and the upper end of shaft B4 is fitted with a .driving plate or disc B7 oil between them. The upper surface of the disc B9 is provided with an annular sheet of suitable abrading material B10, such as leather when the machine is to be used for,

the purpose of stropping the blade.

, Rotation is imparted to the spindle B4 through a flexible belt B11 (see Fig. 2) passin around the pulley B6, thence to the idler pu leys B12 and B13 to a driving pulley C. The idler pulleys are suitably mounted on a standard B14 which is fastened to the base A in any desired manner, allowance preferably being made for settin this standard adjustably relatively to the ase, for example, by making the bolt holes therein elongated so that itmay be moved to a limited extent to a desired position and the bolts tightened to retain it in adjusted position.

The belt B11 is reversibly driven from a pulley C- mounted on a shaft G1 which is journalled in suitable bearings C2, C3 in the standard G4 which in turn is mounted on the base A by bolts C5. The pulley C6 is fast to the shaft C1 by a set screw C7 (Fig. 3) and is adapted to be driven by either one of two belts C8 and G9 which may be driven from a suitable source of power in opposite directions. Means are provided for shifting one or the other of the belts C8 or C9 into operative position on the pulley C6 to drive the shaft C1 while the other runs on one of the loose pulleys C10 and C11.

The means for shifting the belts comprises a pair of slide rods C12 and C13 journalled for longitudinal motion in suitable bearings as C14 and C15 for rod C12 and C16 and C17 for rod C13. Rod C12 is provided with rollers C18, C19 adapted to contact with the edges of belt C8 and guide it between pulleys C6 and C10; and rod C13 is provided with similar rollers C20, C21 for a guiding belt C9 between pulleys C11 and C6. An extension bracket C22 is bolted to one arm of the bracket C4 and carries a short shaft C23 (see Fig. 4) on which are mounted two bell-crank [of the rods C12 and C13. In the present instance lever C24 is connected to rod 013 and lever C25, with rod C12. Movement of either bell-crank lever about the shaft C23 moves the corresfiondingrod longitudinally to shift its belt. 0d 013 is provided with a downwardly extending member C27 (Fig. 1)

adapted to receive one end of a spring C28 (Figs. 1 and 4) the other end of the spring being anchored to a suitable stationary stud C29 which may be integral with bearing C17. Spring C28 thus serves to pull rod C13 to the rights as seen on Fig. 4 thus pulling the upper arm C30 of bell-crank lever C24 downward. This arm C30 may be connected to any suitable operating mechanism, preferably situated above the machine, by means of the pullrod C31.

This mechanism will be hereafter referred to as the overhead mechanism and may take the form of the mechanism illustrated in my prior Patent No. 1,235,590 issued to me August 7th, 1917 Bell-crank lever C25 which is adapted to move the rod C12 has on its upper arm C32 a pin C33 which is connected-by a spring C34 to an anchorage here shown as a hook C35 fastened to the base A, the spring tending to swing the lever C25 in a counterclockwise direction about its axis as seen in Fig. 3 and shift the belt C8 to the fast pulley.- A pull rod C36 is connected to the outer end of arm C32 and to the overhead mechanism above referred to. In this way it will be seen that by proper manipulation of pull rods'C31 and C36, either of the belts C8 and C9 can be shifted into or out of driving position on the pulley C6, to drive the abrading disc B10 in the desired direction.

The means for reciprocating the abrading disc B10 in a vertical direction act through the step-bearing B5. This mechanism includes a pinion D fastened to the right hand end of shaft C1, as seen on Fig. 3, which meshes with a larger pinion or gear wheel D1 mounted on a countershaft D2 fixed in the bracket C4. The gear wheel D1 has a the requirements of the work by being shift-- ed in a radial slot in the gear. The crank pin D3 is connected by a link D4 to a rocker arm D5 fixed to a shaft D6 which is journalled in suitable bearings in a bracket D7 which in turn is suitably attached as by bolts D8 to the base A. The step-bearing B5 is mounted on an arm D9 which is adjustably mounted on the shaft D6 by means of a split clamp, the ends of which are brought together by a bolt D10. Arm D5 is here shown as similarly attachedv to shaft D6, the outer split ends being-brought together by a bolt D11. The link D4 may be composed of two sections bolted together b bolts D12, (Fig. l) which pass through e ongated o enin D13 in one section and are threaded into t e other. It will be seen, therefore, that by adjusting the position of the step-bearing B5 relatively to the crank pin D3 as by loosening bolts D12, D11, or D10, the range in which the bearing B5 will oscillate can be adjusted and determined. Also by adjusting the crank pin D3 toward or away from the axis of the gear D1, the amplitude of the oscillatory motion of step-bearing B5 and consequently of the reciprocation of the abrading disc D10 may be controlled.

Means will now be described for giving the abrading disc B9 a relatively slow rotary motion of translation in its plane of rotation in addition to and independently of its high speed rotation. A pulley E driven by a round belt E1 is mounted on a shaft E2 journalled in bearings E3, E4 of the bracket E5 which is suitably secured to an upwardly extending portion C37 fixed to the bracket G4 at bearing C3. Shaft E2 is provided between its bearings E3 and E4 with a worm E6 which meshes with a worm-wheel E7 mounted or fixed to a vertical countershaft mounted in suitable bearings in a bracket C37. At its upper end this countershaft has fixed thereon a crank disc E8 having a crank pin E9 adj ustable toward and away from its axis in a radial slot E10.

The abrading disc B9 is provided at or adjacent to its center with an upstanding pin B15 which is connected to the crank pin E9 by a link E11, the link being provided between its ends with an elongated slot E12 in which is received a fulcrum block E13 mounted to oscillate freely on a fixed vertical shaft E14 so that the link E11 may swing angularly and also shift longitudinally upon its fulcrum. Shaft E14 is fixed to a bracket E15 fastened to the bracket B. By this mechanism the pin B15 and the abrading disc B9 will be given a relatively slow bodily motion in a circular path, this motion taking place simultaneously with and independently of the high speed rotary motion of the disc about its own axis.

The means for holding the blade, which will be referred to variously as the blade holder or blade clamp, is designed to be operated by hand in opening and closing the holder for inserting and removing blades, and is designed to be automatically operated as regards its various movements relatively to the abrading disc. In general, the movements are these; first, oscillating the blade clamp in a direction substantially lengthwise of the blade, which in the present machine is also substantially radial with respect to the abrading disc; second, a swinging movement in a plane perpendicular to t e plane of the disc, in the present instance a vertical plane extending substantially through the normal position of the center of the disc; and third, a rotating movement for reversing the blade to present one bevel or the other to the abradin surface.

he blade clamp support F constitutes the upper member of a parallel motion linkage, the lower member of which in the resent 1nstance is a portion of the bracket and the side members, the links F1 and F2. The link F1 is pivoted to the bracket B at F3 and to the support F at F4, and the link F2 is pivoted to the bracket B at F5 and to the supmt F at F6. Inasmuch as the pivot points 3 and F5 are disposed at the same level and the links F1 and F2 are the same length, the support F is maintained at all times in horizontal position. Means for longitudinally oscillating the blade holder comprise a driving shaft F7 (Fig. 1) journalled in bracket E15 and having at one end thereof a driving pulley F8 adapted to be rotated by a belt from any suitable source of power, preferably one above the machine.

The shaft F7 is provided with a crank disc F9 (Fig. 2) having a crank pin F10 adjustable toward and away from its center. This adjustment may be accomplished by means of a radial slot, as shown in dotted lines. The crank pin F10 is connected to the support F by a link F11 which may be made adjustable as to length in the same manner as the link D4. In this way the support F and the blade holder are given an oscillatory motion in a substantially horizontal direction which is adjustable both as to range and amplitude. This motion is a relatively slow one so as to permit a blade being inserted in the blade clamp or removed therefrom without stopping the oscillatory motion.

The support F is here shown in two sections F12 and F13 connected by bolts F14, as shown on Figs. 1 and 6. Section F12 of the support is extended upwardly at F15 and provided at its upper end with a pair of lugs to which is pivoted for swinging movement shaft F18 (Fig. 8). The blade holder G, is provided w th a pair of downwardly extending lugs bearing G1 and G2 formlng bearings surrounding the shaft F18, whereby the blade clamp G may be swun about said shaft in a manner to be later fescribed.

Automatic means are provided for swinging the blade-holder G about the shaft F18 and these comprise a countershaft F19 which is mounted in the su port F and connected to the blade holder 8 by a short shaft F20 having a universal joint at either end, whereby the blade holder G may be swung about the shaft F18 irrespective of the angular positionFof the arm F16 relatively to the support The shaft F19 has integral therewith or suitably fixed thereon a pinion F21, which is i an arm F16, the arm having thereon a pair .of upstanding lugs F17 in which is fixed a I adapted to be rotated by a gear segment F22 .transverse y.

mounted on a second countershaft in the support F. The ear segment F22 is fast to a rocking yoke 23 symmetrically formed and havin lateral arms F24, F25 extending These laterally extending arms are connected to downwardl extendin links F26, F27 respectively an b these lin to the free ends of levers F28, 29 respectively. Levers F28 and F29 are each pivoted to a fixed art of the frame here shown as a part of t e bracket B. The ends of levers F28 and F29 opposite to the vertical links F26 and F27 are connectedby pull rods F30, F31 to any suitable operable mechanism, as for exam Ie, the overhead mechanism above referre to. The joints between links F26, F27 and the arms F24, F25 respectively are made loose to allow for the necessary lost motion incident to the oscillation of thesupport F in various positions of the blade clamp G. In this way it will be seen that by suitable operation of the pull rods F30 and F31 the rocker oke F23 and segmental gear F22 may be roc ed about their axes, thereby rotating the shaft F19 through the pinion F21, and by means of the shaft F20 and universal connections, swinging the blade clamp G about the shaft F18, all irrespective of the relative angular position of arm F16 with the support F. Means are provided for limiting this swinging movement of the holder shown here as adjustable stops F32 and F33 (Fig. 6), which may be in the form of plugs screwed into and through the arm F16 from its lower portion and which may be held in adjusted position by means of suitable set screws F34 (Fig. 1).

A means is also provided for holding the blade .holder G in a plurality of predeter mined angular positions with respect to the arm F 16, such means here taking the form of a flat sided portion F35 of the holder (Figs. 1 and 5) coacting with a flat spring F36 fast to the arm F16 by screws F37. This flat sided portion F 35 is preferably provided with three substantially flat faces, as seen most clearly on Fig. 6, one a face being disposed at right angles to the general plane of the blade clamp and adapted to hold the clamp in the full line position asseen in Fig. 6 and the other two inclined relatively to said plane and adapted bycoacting with the spring F36 to hold the blade clamp F in either one of the dotted line positions shown, accordin to which face is presented to the spring. 7Vhen in one of the dotted line posi tions, the inclined faces of member F35 are not presented flush to the spring but at a slight angle, whereby the spring at all times exerts a force tending to hold the blade clamp G against one or the other of the stop pins F32 or F33.

tube F42 which is adapted to slide on a rod F43 fixed to the base A. Any desired number of annular weights F44 may be placed on the plate F41, and the pressure of contact of blade and abrading surface thereby determined.

Any desired type of blade clamp may be employed, but in the present embodiment of the invention I prefer to employ a clamp adapted to receive and retain blades of the type used in surgeons knives of the type shown in my Patent No. 1,625,778 dated April 19, 1927, the clamp being similar in its action to that of the knife handle itself, but being adapted for quicker operation for the insertion and removal of knife blades to be sharpened.

In the present instance a relatively fixed lower jaw G3 is employed of which the lugs G1 and G2 above referred to are a part, and in combination therewith is a relatively movable upper jaw G4 pivoted at its rear end by a pin G5 to an upstanding U-shaped portion G6 fixed by riveting to the lower jaw G3. A second U-shaped portion G7 is riveted to the lower jaw G3 so as to surround the upper jaw and guide it in its movement. On the upper edge of the upper jaw G4 there is located a slide G8, the rear end of which passes through the U-shaped member G6 and the front end of which is made wedge-shaped as shown at G9 to co-act with the complementarily shaped inner side G10 of the loop of the U-shaped member G7. Means are provided for actuating both the slide or wedging bar G8 and the upper jaw G4, whereby the clamp may be easily and quickly opened and closed, such means in the present case taking the form of an operating lever G11 pivoted to the lower jaw at G12 and passing between spaced pins G13, G14 on the Wedging bar G8. In the present instance lever G11 is bifurcated in its operative portion so as to move the various parts evenly and avoid lateral strains. The upper jaw G4 is provided with an outstanding pin G15 working in an elongated slot G16 in alink G17 pivoted to the operating lever G11 at-G18. The operation of the blade clamp is as follows; assuming that the blade clamp is open, in the position shown in Fig. 8, a movement of the lever G11 in toward the left about its pivot G12 will result in its contacting with a pin G13 thereby forcing the cam surface G9 of the wedging bar G8 under the loop of the U-shaped member G7 thus forcing the upper jaw G4 into closed position as seen in ig. 1 and looking it in that position. On movement of the lever G11 in the opposite direction, the blade clamp is first unlocked by the lever G11 contacting with the pin G14 and moving the wedging bar G8 to the right as seen in Fig. 8. Continued movement of the lever C11 brings the pin G15 against the end of the elongated slot G16, at which time the link G17 is effective to swing the upper jaw G4 to the open position shown in Fig. 8, the wedging bar being'simultaneously drawn further from the looped member G7. Jaws G3 and G4 are preferably longitudinally slotted, as shown at G19 and G20 for the reception of a blade as seen on Figs. 5 and 8 and both jaws have therein substantially circular recesses G21 for longitudinally positioning said blade. It is to be understood however that any other suitable blade holding and positioning means could be used in connection with these jaws according to the character of the blade to be sharpened.

When the blade clamp G with the blade in it is turned over into one of its operative positions, as shown in dotted lines in Fig. 6, one of the bevels of the blade comes in contact with the abrading disc. When this occurs the blade spring F36, being relatively stiff, holds the blade clamp in such position relatively to the arm F16 that the weight mounted in members F38 is lifted with the arm about the edge of the blade as a fulcrum. Inasmuch as the abrading disc is oscillated in a vertical direction there will be various angular relationships between the plane of the blade and the plane of the disc as shown on Figs. 10 and 11 during which all parts of the curved bevel of the blade will be subjected to the abrading action of the disc. The result in practice is to cause the stropping action of the disc to travel progressively from one end of the blade bevel to the other and back again. In case a blade edge is to be sharpened which is substantially longer than the width of the abrading surface as shown on Fig. 5,,the greater length is taken care of by the oscillatory motion of the support substantially radially of the disc, and as explained above this oscillatory motion being adjustable as to both range and amplitude to take care of blades of various sizes and configurations.

From the foregoing description it is believed the operation of the machine herein shown will be apparent. It is brought to rest in the position shown in Fig. 1 with the blade holder G in its upright position for receiving a blade to be operated on. The complete cycle of the machine is automatic but there is suflicient dwell of the holder in this position to permit an attendant to remove the sharpened or stropped blade and insert a fresh b ade, and this is true although the holder is constantly oscillated lo dinally by the driven crank disk F9.

The machine is set in operation by causing the overhead controlling mechanism to timetion. This immediately acts through the ull rods F30 and F31 to swing the blade ho der so as to osition the blade upon the abrading disc 9 and through the pull rods C31- and 036 to shift the proper drivin belt to the pulley 06 for driving the abr-a ing disc in the corresponding direction. Fig. 2 shows the disc driven in a counter clockwise direction and the blade disposed so that the abrading surface B10 travels from its edge. With the blade so positioned the lon 'tudinal oscillation is imparted to the hol er from the crank disc F9 and a slow vertical reciprocat1on is imparted to the abrading disc from the crank disc D1. The abrading disc B9 is meanwhile rotating with the compound motion imparted to it by the rotary driving plate B7 and the crank disk E8. As already explained these combined movements eflect a progressive stropping action upon one side of the edge of the blade, from point to heel and back again. When one side of the blade edge has been sufliciently treated the overhead mechanism reverses the position of the pull rods, whereupon the holder is swung through substantially 180 degrees to present the other side of the blade edge in operative position and simultaneously the direction of rotation of the abrading disc is reversed.

While I have shown and described the preferred embodiment of my invention, it is to be understood that many changes or modifications might be made therein without departing from the spirit of the invention, and also many of the adjustments and even some of the movements might be dispensed with without losing the efl'ect ofthe remainder. For this reason, I do not wish to be limited to the construction or combinations 'of parts as shown in this specific embodiment, but merely by the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a blade sharpening machine, a rotary disc, an abrading disc resting loosely thereon and adapted to be rotated thereby, means for holding a blade against the abra ing disc, and means for imparting to the abrading disc during its rotation and relative to said rotary disc a uniform bodily movement transversely of its rotary axis.

2. In a blade sharpening machine, a rotary disc, an abrading disc supported thereby and adapted to be rotated thereby, means for holding a blade against the abrading disc, and means for imparting to the abrading disc during its rotation and relative to said rotary disc a bodily movement of translation in a circular path.

3. In a blade sharpening machine, a spindle mounted for rotation about a fixed axis, an abrading disc carried thereby and rotatable therewith, means for holding a blade against the disc, and means for imparting to the disc during its rotation a uniform bodily movement transversely with respect to the fixed axis of the spindle.

4. In a blade sharpening machine, a disc having an abrading face, pivotally mounted means for holding a lade resiliently against said face in either of two pivoted positions, a shaft, means driven from said shaft for driving the disc in opposite directions, means driven from said shaft for bodily moving the disc in the direction of itsrotary axis, and means for automatically pivoting the holder upon reversal of the disc.

5. In a blade sharpening machine, a disc having an abrading face, means for holding a blade resiliently against said face, means for rotating the disc, and rotary power driven means for bodily moving the disc in the direction of its rotary axis, said last named means having provision for adjusting the amplitude and also the range of said movement.

6. In a blade sharpening machine, a disc having an abrading face, means for holding a blade against said face, means for rotating the disc, means for imparting to the disc during its rotation a bodily movement of translation in a circular path, and other means for uniformly reciprocating the disc in the direction perpendicular to its plane of rotation during its rotation.

7. In a blade sharpening machine, an abrading member, a blade holder mounted for pivotal movement on two right angular axes, one of said mountings permitting bodily movement of the holder to carry its blade toward and from the member, a weight for causing such movement toward the member, the other mounting permitting oscillation of the holder to engage opposite sides of the blade with the member, a spring acting on the holder and so cooperating with the weight that an edge of the blade is held angularly against the member in either oscillated position of the holder, and means for driving the member.

8. In a blade sharpening machine, a disc having a flat abrading surface, a blade holder reversible on an axis disposed radially with respect to the disc and also movable bodily about a relatively transverse axis in a manner to engage a blade held thereby with and disengage it from said surface, a weight effective to move the holder about its transverse axis in a direction to hold the blade engaged with the surface, and a spring acting on the holder and tending to swing it about an edge of the blade enga ed against the disc as a fulcrum to lift thexolder and weight.

9. In a blade sharpening machine, an abrading member, a blade holder mounted for pivotal movement on two relatively right angular axes, one of said mountings permittin bodily movement of the holder to carry its blade toward and from the member and the other mounting permitting oscillation of the'holder to engage opposite sides of the blade with the member, and means for alternately driving the member in opposite directions and simultaneously therewith automatically oscillating the holder upon the reversals of said drive.

10. In a blade sharpening machine, an abrading disk, a support located outside the periphery thereof and movable toward and from the disk, a blade holder carried by said support and mounted for pivotal movement on two relatively right angular axes, one of said mountings permitting bodily movement of the holder to carry the blade toward and from the face of the disk and the other mounting permitting oscillation of the holder to engage opposite sides of blade with the disk, means for driving the disk, and means for reciprocating the support toward and' from the disk to move the blade edge lengthwise thereon.

11. In a blade sharpenin machine, a

member having a plane abra ing surface, a support movable toward and from the member, a blade holder carried by said support and mounted for pivotal movement on an axis'parallel to said surface and adapted to hold a blade in a position to engage said surface, means for driving the member, and means for moving the support toward and from the member, said last named means having provision for changing both the am plitude and range of said movement.

12. In a machine for operating on curved blade edges, an abrading member having a plane blade engaging surface, a blade holder mounted for pivotal movement on an axis parallel with said surface and adapted to hold a blade in position to engage a curved edge thereof with said surface, means for driving the member, and means for moving the member in a direction normal to said surface whereby the surface progressively engages the blade along its curved edge as the holder is rocked about its said pivotal axis.

13. In a machine for sharpening curved blade edges, a rotary abrading member having a plane blade engaging surface, a blade holder mounted for pivotal movement on an axis right angular to the rotary axis of the member and adapted to hold a blade in poment between the member and blade is carried along said curved edge.

14. In a blade sharpemn machine, the combination with a rotary a rading disc of 6 a blade holder pivoted on an axis transverse to the rotary axis of the disc and adapted to support a blade with a curved edge thereof engaged against the disc, means for reciprocating the disc lengthwise of its rotary axis 10 to cause the abrading action to travel along the said curved edge, and means for main taining uniform pressure of the said curved edge on the disc in all positions of the blade. 15. In a blade sharpening machine, a disk having an abrading face, means for holding a blade against said face, a driving member having a slip connection with said disk for rotating the same, a lever pivotally connected to said disk at its axis, and meansfor rocking the lever to shift the disk bodily with respect to the driving member.

16. In a blade sharpening machine, a flat abrading disk, means for presentin a blade thereto, a driving member having rictional connection with said disk for rotating the same, an oscillating lever connected to said disk, and means including an adjustable crank pin for shifting the disk transversely }with respect to the axis of its driving mem- 17. In a blade sharpening machine, a rotary support, a flat abrading disk arranged to float thereon and be rotated thereby, means for presenting a blade to the disk, and means for positively movin the disk in a predetermined path upon t e face of said support.

18. In a blade sharpening machine, an abrading disk arranged to rotate about a vertical axis, a vertically rockin blade holder for presenting a curved bla e thereto, and means for continuously reciprocating the disk bodily in a vertical path to rock the edge of the blade from one end thereof to the other upon said disk.

19. In a machine for sharpening curvededge blades, a rotary abrading disk, means for reciprocating the disk bodily in a path at right angles to its efiective face, a blade holder located without the periphery of the disk and having means for holding a blade in a position transverse to the rotary movement of the disk, and means for oscillating the holder toward and from the disk to move the edge of the blade lengthwise thereon.

20. In a blade sharpening. machine, a rotary abrading disk movable bodily in the direction of its axis, a blade holder mounted to oscillate about an axis beyond the periphery of the disk in a path at right angles to its face and also aboutan axis substantially parallel to the face of the disk to present the lade either side uppermost thereto, means for causin the blade to follow the movement 66 of the dis with a predetermined degree of pressure thereon, and means for causing relative movement of the blade and disk length- WILLIAM E. NICKERSON. 

